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From d183a940ddd189d5d38df841da005d8dbf966875 Mon Sep 17 00:00:00 2001
From: Len Brown <len.brown@intel.com>
Date: Mon, 1 May 2017 23:06:08 -0400
Subject: [PATCH] intel_pstate: use updated msr-index.h HWP.EPP values

References: bnc#1068680 Update schedutil and intel_pstate to default to load-based policy
Patch-mainline: v4.13-rc1
Git-commit: 3cedbc5a6d7f7c5539e139f89ec9f6e1ed668418

intel_pstate exports sysfs attributes for setting and observing HWP.EPP.
These attributes use strings to describe 4 operating states, and
inside the driver, these strings are mapped to numerical register
values.

The authorative mapping between the strings and numerical HWP.EPP values
are now globally defined in msr-index.h, replacing the out-dated
mapping that were open-coded into intel_pstate.c

    new old string
      0   0 performance
    128  64 balance_performance
    192 128 balance_power
    255 192 power

Note that the HW and BIOS default value on most system is 128, which
intel_pstate will now call "balance_performance" while it used to call it
"balance_power".

Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Mel Gorman <mgorman@suse.com>
---
 drivers/cpufreq/intel_pstate.c | 34 +++++++++++++++-------------------
 1 file changed, 15 insertions(+), 19 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index d61d71d307de..7053d3a38a59 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -658,6 +658,12 @@ static const char * const energy_perf_strings[] = {
 	"power",
 	NULL
 };
+static const unsigned int epp_values[] = {
+	HWP_EPP_PERFORMANCE,
+	HWP_EPP_BALANCE_PERFORMANCE,
+	HWP_EPP_BALANCE_POWERSAVE,
+	HWP_EPP_POWERSAVE
+};
 
 static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data)
 {
@@ -669,17 +675,14 @@ static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data)
 		return epp;
 
 	if (static_cpu_has(X86_FEATURE_HWP_EPP)) {
-		/*
-		 * Range:
-		 *	0x00-0x3F	:	Performance
-		 *	0x40-0x7F	:	Balance performance
-		 *	0x80-0xBF	:	Balance power
-		 *	0xC0-0xFF	:	Power
-		 * The EPP is a 8 bit value, but our ranges restrict the
-		 * value which can be set. Here only using top two bits
-		 * effectively.
-		 */
-		index = (epp >> 6) + 1;
+		if (epp == HWP_EPP_PERFORMANCE)
+			return 1;
+		if (epp <= HWP_EPP_BALANCE_PERFORMANCE)
+			return 2;
+		if (epp <= HWP_EPP_BALANCE_POWERSAVE)
+			return 3;
+		else
+			return 4;
 	} else if (static_cpu_has(X86_FEATURE_EPB)) {
 		/*
 		 * Range:
@@ -717,15 +720,8 @@ static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data,
 
 		value &= ~GENMASK_ULL(31, 24);
 
-		/*
-		 * If epp is not default, convert from index into
-		 * energy_perf_strings to epp value, by shifting 6
-		 * bits left to use only top two bits in epp.
-		 * The resultant epp need to shifted by 24 bits to
-		 * epp position in MSR_HWP_REQUEST.
-		 */
 		if (epp == -EINVAL)
-			epp = (pref_index - 1) << 6;
+			epp = epp_values[pref_index - 1];
 
 		value |= (u64)epp << 24;
 		ret = wrmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, value);